TW201436417A - Managed multi-phase operation - Google Patents

Abstract

Systems and methods for maximum deviation multi-phase operation provide techniques for controlling voltage regulators and tap changers in a multi-phase system to operate within a maximum deviation window. The maximum deviation window comprises a low boundary value and a high boundary value. In an example embodiment, systems and methods provide techniques for setting the low boundary value and the high boundary value. In another example embodiment, systems and methods provide techniques for optimized power factor correction in a multi-phase system.

Description

Managed multiphase operation Related application

The present application claims priority to U.S. Provisional Application Serial No. 61/605,643, the entire disclosure of which is incorporated herein by reference.

The present invention generally relates to a managed multiphase voltage regulation and control in a multiphase power system having a single phase control; and a system for managed multiphase voltage regulation and control having a single phase control , methods and devices.

Multiphase power systems, which carry two or more alternating currents, are a common form of power distribution. The AC line of a multiphase power system typically has one phase from other phase offsets. This allows the multiphase system to transmit more power than a single phase power system. A typical example of a multiphase system is a three phase power system. In a multiphase system, a voltage regulator controller is used to maintain local operational control of a plurality of connected single phase mechanisms that make up the multiphase system. The voltage regulator controller is communicatively coupled to a voltage regulator that includes a tap changer. The tap changer is capable of changing one of the voltage regulator tap positions to provide variable/step voltage output regulation associated with a respective phase. Existing multiphase control methods typically include a mechanism for controlling a single mechanism of a plurality of phases or for adjusting a lockstep group of the plurality of phases. In some situations, such as in the presence of non-uniformly balanced loads, this control approach can exacerbate system imbalances.

In an exemplary embodiment of the present invention, a method for maximum deviation multiphase operation includes setting a low boundary value of one of a maximum deviation window based on a first highest tap position of a plurality of tap changers Setting a high boundary value of one of the maximum deviation windows based on one of the first lowest tap positions of the plurality of tap changers; and based on the plurality of tap changers by the plurality of voltage regulator controllers The respective voltages of the respective plurality of voltage regulators are independently adjusted by averaging the tap positions.

In another exemplary embodiment of the present invention, a system for maximum deviation multiphase operation includes: a plurality of voltage regulators; a plurality of tap changers, wherein each of the plurality of tap changers A tap position configured to change one of the plurality of voltage regulators; and a plurality of voltage regulator controllers configured to set a tap position of the plurality of tap changers. The system further includes a controller coupled to at least one of the plurality of voltage regulator controllers. The controller is configured to set a low limit value of one of the maximum deviation windows based on the first highest tap position of the plurality of tap changers and a first lowest based on one of the plurality of tap changers Set the high boundary value of one of the maximum deviation windows by the tap position. The plurality of voltage regulator controllers are configured to adjust a respective plurality of voltages of the plurality of voltage regulators based on the tap positions of the plurality of tap changers.

In another exemplary embodiment of the present invention, a method for optimizing power factor correction includes: comparing a difference between a measured power factor between two voltage regulators and a pre-determined maximum difference; and when determining the When the difference is greater than the maximum difference, the difference is stored as one of the previous differences in the measured power factor. The method further includes: adjusting, by a controller, a tap position of one of the voltage regulators; comparing a second difference between the measured power factors between the two voltage regulators and measuring the power factor The previous difference; and the second difference of the equivalent power factor is not less than the previous difference of the measured power factor, the controller restores the tap position of the one of the voltage regulators to an earlier Connector position.

In another exemplary embodiment, a method of phase angle balancing includes calculating an initial first phase angle, an initial second phase angle, and an initial third phase angle. The initial first phase angle, the initial second phase angle, and the initial third phase angle form an initial phase balance condition. The method further includes determining whether the initial first phase angle, the initial second phase angle, and the initial third phase angle have a maximum value; and adjusting one of the phases opposite to an initial phase angle having a maximum value .

In another exemplary embodiment, a method of balancing a voltage difference (Δ) includes calculating an initial first voltage difference amount, an initial second voltage difference amount, and an initial third voltage difference amount. The initial first voltage difference amount, the initial second voltage difference amount, and the initial third voltage difference amount form an initial voltage balance condition. The method further includes: determining which of the initial first voltage difference amount, the initial second voltage difference amount, and the initial third voltage difference amount has a maximum value; and adjusting a phase opposite to an initial voltage difference amount having a maximum value One of the output voltages.

10‧‧‧System

60‧‧‧ system

100‧‧‧Multiphase Control System / Multiphase Controller

102‧‧‧Communication link

104‧‧‧Communication link

120‧‧‧ memory

130‧‧‧Voltage regulator controller

132‧‧‧ Tap changer

134‧‧‧Voltage regulator / first phase

136‧‧‧Control signal

138‧‧‧Sensing signal/measurement data

140‧‧‧Voltage regulator controller

142‧‧‧ Tap changer

144‧‧‧Voltage regulator / second phase

146‧‧‧Control signal

148‧‧‧Sensing signal/measurement data

150‧‧‧Voltage Regulator Controller/Network

152‧‧‧ Tap changer

154‧‧‧Voltage regulator / third phase

156‧‧‧Control signal

158‧‧‧Sensing signal/measurement data

160‧‧‧Manage terminal/management computer

610‧‧‧ Leading Voltage Regulator Controller

620‧‧‧Slave voltage regulator controller

630‧‧‧First voltage regulator

640‧‧‧Second voltage regulator

650‧‧‧load

1002‧‧‧Voltage difference

1004‧‧‧Voltage difference

1006‧‧‧Voltage difference

1012‧‧‧ phase angle

1014‧‧‧ phase angle

1016‧‧‧ phase angle

For a fuller understanding of the present invention and its advantages, reference should be made to the accompanying drawings in which FIG. A graphical representation of one of the systems; FIG. 2 is a flow diagram of one of the first portions of one of the methods for maximum deviation polyphase operation in accordance with an exemplary embodiment of the present invention; FIG. 3 further illustrates an example in accordance with the present invention One of the methods of the second embodiment of the method for maximum deviation multiphase operation of the embodiment; FIG. 4 further illustrates one of the methods for maximum deviation multiphase operation according to an exemplary embodiment of the present invention. One of three parts of a flow chart; FIG. 5 illustrates a maximum deviation multiphase operation according to an exemplary embodiment of the present invention A flow chart of another exemplary embodiment of one of the methods; FIG. 6 is a graphical representation of one of the systems for optimizing power factor correction in accordance with an exemplary embodiment of the present invention; A flow chart of one of the methods for optimizing power factor correction according to an exemplary embodiment of the present invention; FIG. 8 illustrates one of the methods for voltage difference balance according to an exemplary embodiment of the present invention. FIG. 9 is a flow chart showing one of methods for phase angle balance according to an exemplary embodiment of the present invention; FIG. 10A is a diagram showing a voltage difference vector according to an exemplary embodiment of the present invention. And FIG. 10B illustrates a phase angle vector diagram in accordance with an exemplary embodiment of the present invention.

The drawings are merely illustrative of the exemplary embodiments of the invention and are therefore not to be construed as limiting the scope of the invention. The elements and features of the present invention are not necessarily to In addition, certain dimensions can be enlarged to help visually convey these principles.

In the following paragraphs, the invention will be described in further detail by way of example with reference to the accompanying drawings. In the description, well-known components, methods, and/or processing techniques are omitted or described in order to not obscure the invention. As used herein, "the invention" means any of the embodiments of the invention described herein and any equivalents thereof. Furthermore, reference to various features of the "invention" does not imply that all embodiments must include the reference features.

In an embodiment, some aspects of the invention are implemented by a computer program executed by one or more processors, as described and illustrated. As is apparent to those skilled in the art, the present invention may be at least partially implemented by various forms of computer readable instructions, and it is not intended that the invention be limited by The processor executes one of a particular set or sequence of instructions.

Referring to the flowcharts of FIGS. 2 through 4 and FIG. 6, it should be noted that the present invention may be practiced using one of the steps illustrated in FIGS. 2 through 4 and FIG. That is, the program flow illustrated in FIGS. 2 to 4 and FIG. 6 is for illustrative purposes only, and the present invention may be practiced using a program flow different from the illustrated program flow. Additionally, it should be noted that not all steps are required in every embodiment. In other words, one or more of the steps may be omitted or substituted without departing from the spirit and scope of the invention. In an alternate embodiment, the steps are performed in a different order, the steps are performed in parallel with each other, or the steps are omitted altogether, and/or some additional steps can be performed without departing from the scope and spirit of the invention.

The exemplary embodiments of the present invention are described in detail with reference to the drawings.

1 illustrates an embodiment of a system 10 for maximum deviation multiphase operation for a plurality of voltage regulators having a multiphase controller. System 10 includes a multi-phase control system 100 and respective tap changers 132, 142, and 152 of voltage regulators 134, 144, and 154. The multiphase control system 100 includes a memory 120 and voltage regulator controllers 130, 140, and 150. Each of the voltage regulator controllers 130, 140, and 150 is configured to set a tap of one of the respective ones of the tap changers 132, 142, and 152, as shown. It should be noted that the voltage regulator controllers 130, 140, and 150 can be integrated together as part of a single controller or separate from each other. It should be further noted that the memory 120 can reside partially within each of the voltage regulator controllers 130, 140, and 150, or as part of the single integrated controller that includes each of the voltage regulator controllers 130, 140, and 150. .

In one embodiment, voltage regulators 134, 144, and 154 each provide a line voltage to a respective phase of one of the 3-phase power delivery systems. However, system 10 can include fewer or more voltage regulators, tap changers, and voltage regulator controllers. Moreover, as understood in the art, each of the tap changers 132, 142, and 152 includes a plurality of taps (the line voltage of one of the voltage regulators 134, 144, and 154 can be selected by the taps) and Voltage Each of the regulators 134, 144, and 154 includes a winding of one of the power transformers. For example, but not limited to, the number of taps available for each of the tap changers 132, 142, and 152 can range from 32 taps to 64 taps. One of ordinary skill will appreciate that the present invention can be embodied using various types of voltage regulators, various types of tap changers, and tap changers having any number of tap positions to choose from.

Each of voltage regulator controllers 130, 140, and 150 receives a sense signal 138, 148, or 158 from one of the respective windings of respective voltage regulators 134, 144, and 154. One of the tap positions is set according to one of the tap changers 132, 142, and 152, respectively, and each sense signal includes a current line output voltage based on one of the windings of the respective voltage regulators 134, 144, and 154 and / or current one of the voltage and / or current sensing signal. Each of the sense signals 138, 148, and 158 further includes allowable voltage regulator controllers 130, 140, and 150 to determine the feedback of the tap positions of tap changers 132, 142, and 152. Each of the tap changers is controlled by one of the control signals 136, 146 or 156 from one of the voltage regulator controllers 130, 140 or 150.

Voltage regulator controllers 130, 140, and 150 are communicatively coupled together via a communication link. In one embodiment, one of the voltage regulator controllers 130, 140, and 150 acts as a preamble, receives feedback from other voltage regulator controllers 130, 140, and 150, and coordinates other voltage regulator controllers 130, 140. And 150 operations, and other aspects. For example, as described in further detail below, the lead controller is configured to transmit in the voltage regulator controllers 130, 140, and 150 a maximum deviation window including one of a low tap position boundary value and a high tap position boundary value, and voltage regulation The controllers 130, 140, and 150 are configured to operate the tap positions of the tap changers 132, 142, and 152 within the maximum deviation window in an operational mode. That is, in an operational mode, voltage regulator controllers 130, 140, and 150 are configured to set tap changers 132, 142, and 152 within an allowable range of one of the tap values defined by the maximum deviation window. Tap. Voltage regulator controllers 130, 140, and 150 are further configured to account for sensed signals 138, 148, and 158 and tap values The taps of the tap changers 132, 142, and 152 are set to the allowable range. Additionally, voltage regulator controllers 130, 140, and 150 are configured to communicate information, such as current tap position information, to the preamble controller such that the preamble controller can manage other series voltage regulator controllers 130, 140, and 150 operating.

Voltage regulator controllers 130, 140, and 150 are communicatively coupled to a network 150 via communication link 102. A management terminal 160 is also communicatively coupled to the network 150 via the communication link 104. Using communication links 102 and 104 and network 150, management terminal 160 can communicate with voltage regulator controllers 130, 140, and 150. For example, management computer 160 can be used to update parameters and settings of voltage regulator controllers 130, 140, and 150 to manage multi-phase operation of voltage regulator controllers 130, 140, and 150.

In general, the multi-phase control system 100 is configured to set one of the maximum deviation windows based on the current highest tap position of one of the plurality of tap changers 132, 142, and 152 and a user-defined maximum deviation value. a low boundary value, setting a high boundary value of the maximum deviation window and adjusting by a plurality of voltages based on a current minimum tap position of the plurality of tap changers 132, 142, and 152 and the user-defined maximum deviation value The controllers 130, 140, and 150 independently adjust the voltages of the plurality of voltage regulators 134, 144, and 154 based on the tap positions of the plurality of tap changers 132, 142, and 152. As described herein, the maximum deviation window includes a range of acceptable tap positions for the plurality of tap changers 132, 142, and 152. In an operational mode, the multi-phase control system 100 communicates the maximum deviation window between the voltage regulator controllers 130, 140, and 150, and the voltage regulator controllers 130, 140, and 150 are defined by the maximum deviation window. The voltages of the voltage regulators 134, 144, and 154 are independently adjusted within the tap position (via the tap changer). For example, one of the voltage regulator controllers 130, 140, and 150 may transmit the maximum deviation window between the controllers.

As described in further detail below, the maximum deviation window MaxDevWin includes an array of high boundary values and low boundary values {low boundary values, high boundary values}. When at a maximum deviation In the phase mode of operation, the high boundary value and the low boundary value represent the high and low boundaries of the tap position of the tap changer. The multiphase control system 100 can set the high and low boundaries of the maximum deviation window with reference to the user-defined maximum deviation value MaxDevU (which can be defined by a manager (eg, using the management terminal 160). When the maximum deviation mode of operation is initiated, the multi-phase controller system 100 can also set the high and low boundaries of the maximum deviation window with reference to the highest current tap position and the lowest current tap position of the managed voltage regulator, as further described below. Described in detail.

In one aspect, the multi-phase control system 100 is configured to set both the low boundary value and the high boundary value of the maximum deviation window to the highest current of the plurality of tap changers based on certain initial conditions of the system 10. The average of one of the tap position and the lowest current tap position. The multi-phase control system 100 is further configured to set both the low and high boundary values to the highest current tap position and minimum of the plurality of tap changers 132, 142, and 152 based on other initial conditions of the system 10. The average of one of the current tap positions.

In other aspects, the multi-phase control system 100 is further configured to determine a difference and a plurality of points between the tap positions of the first and second of the plurality of tap changers 132, 142, and 152. Whether the difference between one of the second and third tap positions of the joint changers 132, 142, and 152 is equal to or greater than the user-defined maximum deviation value, and when it is determined that the differences are equal to or greater than The user-defined maximum deviation value, the position of both of the plurality of tap changers 132, 142, and 152 is set to a low boundary value, and the voltage associated with the two of the plurality of tap changers When the line voltage of the regulator output is higher than a set voltage band, the maximum boundary value and the low boundary value of the maximum deviation window are decremented. The multi-phase control system 100 is further configured to determine a difference between the first and second tap positions of the plurality of tap changers 132, 142, and 152 and a plurality of tap changers 132, Whether one of the difference between the second and third of the 142 and 152 tap positions is equal to or greater than the user-defined maximum deviation value, and when it is determined that the differences are equal to or greater than the user-defined maximum deviation value, the plural The position of the two tap changers is set to the high side a threshold value, and the line voltage of the voltage regulator output associated with the plurality of tap changers is lower than the set voltage band, such that each of the high boundary value and the low boundary value of the maximum deviation window Increment.

Turning to Figure 2, one method for maximum deviation multiphase operation 200 is described. In step 202, the polyphase control system 100 determines if the multiphase maximum deviation mode is enabled. Referring to system 10, a determination can be made based on the current state of system 10, the current state or set value of each of the voltage regulator controllers, and commands or parameters received from, for example, management terminal 160. When the multi-phase control system 100 determines that the condition is set to enable the maximum deviation multi-phase maximum deviation mode, the routine proceeds to step 204. In step 204, the low boundary value and the high boundary value of the maximum deviation window MaxDevWin are set by the multi-phase control system 100. In one embodiment, the low and high values are set to -16 and 16, respectively, but other initial values are within the scope of the present invention. In step 206, MaxDevWin is transmitted between the plurality of voltage regulator controllers 130, 140, and 150, and in step 208, each of the voltage regulator controllers 130, 140, and 150 is set to initiate the maximum deviation polyphase mode. .

After entering the maximum deviation polyphase mode in step 208, a delay occurs in step 210. This delay can be set by the multi-phase control system 100 to allow any tap changes of the tap changers 132, 142, and 152 to occur, as indicated by the voltage regulator controllers 130, 140, and 150 after initiating the maximum deviation polyphase mode. . In an embodiment, the amount of delay time in step 210 may vary depending on design considerations. In step 212, the polyphase control system 100 sets the low boundary value MaxDevL of MaxDevWin to the current highest tap position TPIH of the tap changers 132, 142, and 152 minus the user-defined maximum deviation value MaxDevU. Further, in step 214, the multi-phase control system 100 sets the high boundary value MaxDevH of MaxDevWin to the current lowest tap position TPIL of the tap changers 132, 142, and 152 plus the user-defined maximum deviation value MaxDevU.

In step 216, the polyphase control system 100 determines if the value of MaxDevL is greater than the value of MaxDevH. If it is determined in step 216 that MaxDevL is greater than MaxDevH, the program Proceeding to step 218, when the maximum deviation polyphase mode is initiated, both the MaxDevL and MaxDevH are set by the multi-phase control system 100 to the highest tap position and the lowest tap position of the tap changers 132, 142, and 152. An average value. In step 220, the polyphase control system 100 transmits MaxDevWin between the voltage regulators 130, 140, and 150 and one of the programs is delayed in step 222. After the delay in step 222, the multi-phase control system 100 determines in step 224 whether each of the tap changers 132, 142, and 152 has been stabilized to the direction of the voltage regulator controllers 130, 140, and 150. A tap defined by the average of the highest tap position and the lowest tap position. If the tap changer has not been stabilized, the program returns to step 220 and MaxDevWin is transferred between voltage regulator controllers 130, 140 and 150, and the program is delayed in step 222.

On the other hand, if the tap changers 132, 142, and 152 are each set to the tap defined by the average of the highest tap position and the lowest tap position when the maximum deviation polyphase mode is activated, the program proceeds to the step. 226. In step 226, multiphase control system 100 increments MaxDevH by one. Referring to FIG. 3, after step 226, MaxDevWin (with the updated value of MaxDevH) is transferred between voltage regulator controllers 130, 140, and 150 in step 302, and the program is delayed in step 304. In step 306, the polyphase control system 100 determines if the difference between MaxDevH and MaxDevL is equal to MaxDevU. If not, the program proceeds to step 308 where the multi-phase control system 100 decrements MaxDevL by 1, and in step 310, MaxDevWin is transferred between the voltage regulator controllers 130, 140 and 150, and the program is delayed in step 312. In step 314, the polyphase control system 100 again determines if the difference between MaxDevH and MaxDevL is equal to MaxDevU, and if not, returns to step 226 to increment MaxDevH by one.

It should be noted that in steps 218, 220, 222, 224, 226, 302, 304, 306, 308, 310, 312, and 314, the polyphase control system 100 first responds to one of the "error" conditions determined in step 216. Fold and then reopen the window of available tap positions defined by MaxDevWin. Specifically, if it is determined in step 216 that MaxDevL is greater than MaxDevH, the multi-phase control system 100 first folds the available tap position window in step 218, and waits for the voltage regulator controllers 130, 140, and 150 to tap the tap changers 132, 142 in steps 220, 222, and 224. The tap positions of 152 are set to the same tap position, and then the windows of the available tap positions are gradually reopened in steps 226, 302, 304, 306, 308, 310, 312, and 314.

If the multi-phase control system 100 determines in step 216 that MaxDevL is less than MaxDevH, then the program proceeds to step 402 depicted in FIG. In step 402, MaxDevWin is transferred between voltage regulator controllers 130, 140, and 150, and the program is delayed in step 404. After the delay of step 404, the multi-phase control system 100 allows the voltage regulators 134, 144, and 154 to be independently regulated by the voltage regulator controllers 130, 140, and 150. In particular, in step 406, voltage regulator controllers 130, 140, and 150 use tap changers 132, 142, and 152 to voltage regulate the line voltage output of each of voltage regulators 134, 144, and 154. The voltage regulator controllers 130, 140, and 150 can voltage regulate the line voltages of the voltage regulators 134, 144, and 154 based on the voltage, current, and tap position sense feedback signals 138, 148, and 158.

In steps 408, 410, and 412, the multi-phase control system 100 determines whether the difference between the tap positions of any two of the tap changers 132, 142, and 152 is equal to or greater than MaxDevU. If not, the program returns to step 406 where independent voltage regulation continues. On the other hand, if the multi-phase control system 100 determines in steps 408, 410, and 412 that the difference between the tap positions of any two of the tap changers 132, 142, and 152 is equal to or greater than MaxDevU, the program proceeds to Step 414. In step 414, the polyphase control system 100 determines if the position of both of the tap changers 132, 142, and 152 is set to a high boundary value MaxDevH and is associated with both of the plurality of tap changers. Whether the line voltage of the voltage regulator output is lower than a set voltage band. If the multi-phase control system 100 determines that the condition in step 414 is true, then the program proceeds to step 418 where both MaxDevH and MaxDevL are incremented by one.

Alternatively, if the multi-phase control system 100 determines that the condition in step 416 is false, the program proceeds to step 420 where the multi-phase control system 100 determines if the positions of the tap changers 132, 142, and 152 are set. Whether the line value of the low-limit value MaxDevL and the voltage regulator output associated with both of the plurality of tap changers is higher than the set voltage band. If the multi-phase control system 100 determines that the condition in step 416 is true, then the program proceeds to step 420 where both MaxDevH and MaxDevL are decremented by one. After either step 418 or 420, the program proceeds to step 422 where MaxDevWin is transferred between voltage regulator controllers 130, 140 and 150 and delayed in step 424. After the delay in step 424, the program returns to step 406 where independent voltage regulation continues.

In another embodiment, the multi-phase control system 100 can be further configured to operate the voltage regulator controllers 130, 140, and 150 in various modes of operation. For example, multi-phase control system 100 can control voltage regulator controllers 130, 140, and 150 in a type of enhanced pilot/slave mode in which historical tap positions are recorded over time. That is, the multi-phase control system 100 can track the tap changers 132, 142, and 152, for example, at respective tap positions for a certain time of day or day of the week and store this information in the memory 120. When attempting to resolve a system change or troubleshooting a system fluctuation, the multi-phase control system 100 may refer to historical tap position information stored in the memory 120 based on, for example, a previous (several) period of a day or week. The taps of the voltage regulators 134, 144, and 154 are set at the tap position. Based on this operation, if one of the neutral lines is detected to be lost, a tap changer can be set to a tap position based on a historical tap position during or after repair. The historical tap position data may be stored in the memory 120 every, for example, but not limited to, thirty minutes. The multi-phase control system 100 can also calculate a running average of one of the tap positions over hours, days, or weeks of operation.

In another embodiment, the multi-phase control system 100 can operate in an operational mode to average the line voltages of the voltage regulators 134, 144, and 154 within an allowable deviation. If one of the tap positions between any regulators is within a defined allowable deviation, then more The phase control system 100 can adjust to an average system voltage without exceeding the allowable deviation. The multi-phase control system 100 can be further configured to operate in any of the modes of operation described herein during a user-defined period maintained by a timer.

In other aspects, the multi-phase control system 100 can allow one of the following additional modes of operation after expiration of a timed mode of operation: tap to neutral mode, ganged mode of operation, and adjust to historical tap position mode. The tap-to-neutral mode can be defined by the multi-phase control system 100 by directing each of the tap changers 132, 142, and 152 to tap-to-neutral after the timing mode of operation expires. The coordinated operation mode can be defined by the multi-phase control system 100 locking the entire voltage regulators 134, 144, and 154 in the interlock mode (lock-step operation) based on an average voltage calculation of one of the pilot regulators after the timing operation mode expires. . The adjustment to the historical tap position mode can be defined by the multi-phase control system 100 adjusting to historical tap position data (which was previously stored in the memory 120, as described above) after the timed operational mode expires.

Deactivation of any of the modes described herein may be accomplished by a user selectable option at one of the voltage regulator controllers 130, 140, and 150 or one of the management terminals 160. If a mode is deactivated, the voltage regulator controllers 130, 140, and 150 can resume normal regulation or resume adjustment based on another predetermined mode.

Turning to FIG. 5, another embodiment of a method for maximum deviation multiphase operation 500 is described. In step 502, the multiphase controller 100 determines whether the multiphase maximum deviation mode is enabled. The reference system 10 can make a determination based on the current state of the system 10, the current state or set value of each of the voltage regulator controllers 130, 140, and 150 and the commands or parameters received from, for example, the management terminal 160. When the multi-phase controller 100 determines that the condition is set to enable the maximum deviation multi-phase maximum deviation mode, the routine proceeds to step 504. In step 504, the low boundary value and the high boundary value of the maximum deviation window MaxDevWin are set to the values TPIL and TPIH, respectively. That is, in step 504, the polyphase control system 100 sets the low boundary value MaxDevL of MaxDevWin to the current lowest tap of the tap changers 132, 142, and 152. Position TPIL and set the high boundary value MaxDevH of MaxDevWin to the current highest tap position TPIH in tap changers 132, 142, and 152. In step 506, MaxDevWin is transmitted between the plurality of voltage regulator controllers 130, 140, and 150, and in step 508, each of the voltage regulator controllers 130, 140, and 150 is set to initiate the maximum deviation polyphase mode. .

After entering the maximum deviation polyphase mode in step 508, a delay occurs in step 509. The delay may be set by the multi-phase control system 100 to allow for any tap change of the tap changers 132, 142, and 152 as indicated by the voltage regulator controllers 130, 140, and 150 after the maximum deviation polyphase mode is initiated. . In an embodiment, the amount of delay time in step 509 can vary depending on design considerations. In step 510, multiphase control system 100 calculates the value of MaxDevM (which is defined as TPIH-TPIL). In particular, the value of MaxDevM is equal to the current highest tap position TPIH in tap changers 132, 142, and 152 minus the current lowest tap position TPIL in tap changers 132, 142, and 152.

In step 512, the polyphase control system 100 determines if the value of MaxDevM is greater than the user-defined maximum deviation value MaxDevU. If it is determined in step 512 that MaxDevM is greater than MaxDevU, the program proceeds to step 514, in which the multi-phase control system 100 sets the high boundary value MaxDevH of MaxDevWin to TPIH-1. After step 514, the program proceeds to step 516 where MaxDevWin is transferred between the plurality of voltage regulator controllers 130, 140 and 150. In step 518, the multi-phase control system 100 again calculates the value of MaxDevM, and in step 520, the multi-phase control system 100 again determines if the value of MaxDevM is greater than the user-defined maximum deviation value MaxDevU. If the value of MaxDevM is still greater than the user-defined maximum deviation value MaxDevU in step 520, the program proceeds to step 522, in which the multi-phase control system 100 sets the low boundary value MaxDevL of MaxDevWin to TPIL+1.

After step 522, the program proceeds to step 524 where MaxDevWin is transferred between the plurality of voltage regulator controllers 130, 140 and 150. In step 526, multiphase control The system 100 again calculates the value of MaxDevM, and in step 528, the polyphase control system 100 again determines if the value of MaxDevM is greater than the user-defined maximum deviation value MaxDevU. If the value of MaxDevM is still greater than the user-defined maximum deviation value MaxDevU in step 528, the program returns to step 514 where the polyphase control system 100 decrements the current high boundary value MaxDevH of MaxDevWin by one.

It should be noted that steps 510, 512, 514, 516, 518, 520, 522, 524, 526, and 528 seek to slowly bring the current highest tap position TPIH of the tap changers 132, 142, and 152 to the current lowest tap. The difference between the positions TPIL is within the range defined by the user-defined maximum deviation value MaxDevU. Especially when the maximum deviation polyphase mode is first started, the value of MaxDevM can be greater than the value of MaxDevU. In method 500, this condition is identified in steps 512, 520, and 528 (and later in step 536). It should also be noted that after the maximum deviation polyphase mode is initiated in step 508, each voltage regulator controller 130, 140, and 150 controls the tap position of its respective tap changer 132, 142, and 152 and causes the tap position It is maintained within the position defined by the maximum deviation window MaxDevWin. Initially, since the maximum deviation window MaxDevWin is set to the current highest tap position TPIH and the current lowest tap position TPIL in the tap changers 132, 142, and 152 in step 504, the voltage regulator controllers 130, 140 and 150 does not need to change the tap position. However, since the maximum deviation window MaxDevWin upper boundary MaxDevH and the lower boundary MaxDevL are incrementally constrained in steps 514 and 522, the voltage regulator controllers 130, 140, and 150 may change the tap position as appropriate to cause the tap changer 132. The tap positions of 142 and 152 are within the range of allowable tap positions defined by MaxDevWin. Next, the difference MaxDevM between the current highest tap position TPIH and the current lowest tap position TPIL in the tap changers 132, 142, and 152 will decrease. In this way, the value of MaxDevM will eventually converge to a value equal to or less than the user-defined maximum deviation value MaxDevU.

If it is determined in step 512, 520 or 528 that the value of MaxDevM is equal to or less than the user-defined maximum deviation value MaxDevU, the program proceeds to step 530, where at step 530 A stable delay occurs. The delay in step 530 can be configured to be the same or different than the delay in step 509. In step 532, the polyphase control system 100 reads the current tap position of each of the tap changers 132, 142, and 152, and in step 534, calculates, retrieves, or determines the values of MaxDevM, MaxDevH, and MaxDevL. . In step 536, the multi-phase control system 100 determines if the value of MaxDevM is greater than the user-defined maximum deviation value MaxDevU. If it is determined in step 536 that the value of MaxDevM is greater than the user-defined maximum deviation value MaxDevU, then the program proceeds to step 514 as illustrated. Alternatively, if it is determined in step 536 that the value of MaxDevM is equal to or less than the user-defined maximum deviation value MaxDevU, the program proceeds to step 538 where MaxDevWin is transmitted between the plurality of voltage regulator controllers 130, 140, and 150. In general, step 538 can be considered to include a steady state in which independent voltage regulation is continued by voltage regulator controllers 130, 140, and 150.

In steps 540, 542, and 544, the multi-phase control system 100 determines whether the difference between the tap positions of any two of the tap changers 132, 142, and 152 is equal to or greater than MaxDevU. If the multiphase control system 100 determines in any of steps 540, 542, and 544 that the difference between the tap positions of any two of the tap changers 132, 142, and 152 is equal to or greater than MaxDevU, the program proceeds to the step 546. In step 546, the multi-phase control system 100 sets a MaxDevF flag indicating that the tap positions of the tap changers 132, 142, and 152 are set within limits defined by the user-defined maximum deviation value MaxDevU. In step 546, the polyphase control system 100 also begins a timer ModeSelectTimer. If the timer ModeSelectTimer expires or overflows, the program defined by method 500 will exit to another predetermined routine, and the timer ModeSelectTimer will typically run when the MaxDevF flag is set. The timer ModeSelectTimer can be timed or counted and can be set to run for a predetermined and configurable amount of time until, for example, one of the methods 500 is interrupted. In this manner, if the tap positions of the tap changers 132, 142, and 152 are set to be used during an extended pre-determined and configurable period of time Within the limits defined by the maximum deviation value MaxDevU, the timer ModeSelectTimer will cause the program defined by method 500 to be interrupted or terminated.

If the multiphase control system 100 determines in steps 540, 542, and 544 that the difference between the tap positions of any two of the tap changers 132, 142, and 152 is not equal to or greater than MaxDevU, then the program proceeds to step 558. In step 558, the polyphase control system 100 clears the MaxDevF flag and stops or resets the timer ModeSelectTimer, and the program proceeds to step 530. Therefore, if the multiphase control system 100 determines in steps 540, 542, and 544 that the difference between the tap positions of any two of the tap changers 132, 142, and 152 is not equal to or greater than MaxDevU, then the voltage is generally regulated. Controllers 130, 140 and 150 continue independent voltage regulation.

In step 548, the multi-phase control system 100 determines whether the position of both of the tap changers 132, 142, and 152 is set to a high boundary value MaxDevH and is associated with both of the plurality of tap changers. Whether the line voltage of the voltage regulator output is lower than a set voltage band. If the multi-phase control system 100 determines that the condition in step 548 is true, then the program proceeds to step 552 where both MaxDevH and MaxDevL are incremented by one. Alternatively, if the multi-phase control system 100 determines that the condition in step 548 is false, the program proceeds to step 550 where the multi-phase control system 100 determines if the positions of the tap changers 132, 142, and 152 are set. Whether the low boundary value MaxDevL and the line voltage output by the voltage regulator associated with the plurality of tap changers are higher than the set voltage band. If the multi-phase control system 100 determines that the condition in step 550 is false, the program returns to step 530. Alternatively, if the multi-phase control system 100 determines that the condition in step 550 is true, then the program proceeds to step 554 where both MaxDevH and MaxDevL are decremented by one. After either step 552 or 554, the program proceeds to step 556 where MaxDevWin is transferred between voltage regulator controllers 130, 140 and 150 and the program proceeds to step 530 to continue the independent voltage by voltage regulator controllers 130, 140 and 150. Adjustment.

Turning to Figure 6, a system 60 for optimizing power factor correction is described. System 60 packs a pre-voltage regulator controller 610, a follow-up voltage regulator controller 620, a voltage regulator 630 of phase A of a first power system, a voltage regulator 640 of phase A of a second power system, and A load of 650. Figure 6 illustrates one of the parallel connections between the common phases "A" of two separate multiphase power delivery systems. In Figure 6, the line outputs from the common phases of two different power systems are coupled or connected in parallel to drive the load 650. In this configuration, the phase A from both the first power system and the second power system supplies power to the load 650, which is necessary when the load 650 requires a large amount of power. Voltage regulators 630 and 640 are similar to the voltage regulators described with reference to FIG. Each voltage regulator 630 and 640 adjusts the phase A voltage of a phase of a respective multiphase power system.

The lead voltage regulator controller 610 and the follower voltage regulator controller 620 are configured to adjust the phase A of the first power system and the second power system using the first voltage regulator 630 and the second voltage regulator 640, respectively Line output voltage. Based on the voltage and/or current sensing feedback signal, the lead voltage regulator controller 610 and the follower voltage regulator controller 620 can change the tap change of the first voltage regulator 630 and the second voltage regulator 640 as appropriate. Adjust the output voltage by tapping the connector. In the configuration depicted in FIG. 6, the preamble voltage regulator controller 610 is communicatively coupled to the follower voltage regulator controller 620 and the lead voltage regulator controller 610 directs the follower voltage regulator controller 620. For example, the pilot voltage regulator controller 610 can be programmed with a voltage to regulate for the load 650 and coordinate the voltage control of the slave voltage regulator controller 620 accordingly.

Because the line outputs from voltage regulators 630 and 640 are coupled together to drive load 650 as depicted in FIG. 6, if there is an imbalance between the voltage regulators, the circulating current can be at voltage regulator 630. Flowing between 640. The existence of this imbalance can be attributed to differences in properties of the respective voltage regulators 630 and 640, such as impedance mismatch. The imbalance can be at least partially identified by voltage regulator controllers 610 and 620 by measuring the difference in power factor of the power delivered by each of voltage regulators 630 and 640. Thus, the lead voltage regulator controller 610 and the follower voltage regulator controller 620 are configured to use the voltage regulators 630 and 640. A voltage and current sense signal is provided to measure the power factor of the power delivered by each of voltage regulators 630 and 640. As understood in the art, the power factor is defined as the ratio between the actual power delivered and the absolute value of the transmitted complex power. Ideally, the power factor of the power delivered by voltage regulators 630 and 640 will be one.

When the power factor of the first voltage regulator 630 is different from the power factor of the second voltage regulator 640, a circulating current will flow between the two regulators, which results in energy loss and may cause system damage. One way to correct the difference in power factor is to change the tap position of the tap changer of voltage regulator controllers 630 and 640.

In this context, one method 700 of optimizing power factor correction is described with reference to FIG. It should be noted at the outset that the steps of method 700 may be performed in combination by one of lead voltage regulator controller 610, follower voltage regulator controller 620 or lead voltage regulator controller 610 and follower voltage regulator controller 620. In step 710, one of the measured power factor differences between the power output by the first voltage regulator 630 and the second voltage regulator 640 is compared to a user-defined maximum difference. For example, if the power factor of the power output by the first voltage regulator 630 is measured to be 0.95, the power factor of the power output by the second voltage regulator 640 is measured as 0.8, and the user-defined maximum difference is 0.1. The condition in step 710 is true and the program proceeds to step 720.

In step 720, an average of one of the line voltages output by each phase is calculated and compared to the average value and one of the user-defined voltages is set for the adjustment. If the average voltage is equal to or greater than the adjustment set voltage, the program proceeds to step 722, where the difference between the measured power factors between the powers output by the first voltage regulator 630 and the second voltage regulator 640 is stored in the memory. Medium (ie, as (for example) Δ1). In step 724, the follower voltage regulator controller 620 commands the second voltage regulator 640 to a lower tap position. In step 726, the difference in power factor is compared to the previous value stored in the memory to determine if it is lower than the previous value. In other words, after the tap position of the second voltage regulator 640 is lowered, the power output by the first voltage regulator 630 and the second voltage regulator 640 is measured again. The difference in power factor is compared and the difference is compared to the power factor measured before the tap position of the second voltage regulator 640 is lowered. If the difference is lower, the program returns to step 710 to determine if the new difference in power factor is less than the user-defined maximum.

Alternatively, in step 720, if the average voltage is not equal to or greater than (ie, less than) the set voltage, the program proceeds to step 723 where the power output by the first voltage regulator 630 and the second voltage regulator 640 is The difference between the measured power factors is stored in the memory (ie, as, for example, Δ1). In step 725, the lead voltage regulator controller 610 commands the first voltage regulator 630 to a higher tap position. It should be noted that the first voltage regulator 630 to a higher tap position is acceptable in step 725 as compared to step 724 because the average voltage is not found to be equal to or greater than the regulated set voltage in step 720. In step 727, the difference in power factor is compared to the previous value stored in the memory to determine if it is lower than the previous value. If the difference is lower, the program returns to step 710 to determine if the new difference in power factor is less than the user-defined maximum.

Returning to step 726, if the difference in power factor is compared to the previous value and the difference in power factor is determined to be higher than the previous value, the process proceeds to step 728, in which the slave voltage regulator controller 620 commands the second voltage regulator 640 to increase the score. Connector location. It should be noted that because the difference in power factor after the tap reduction command in step 724 is not determined in step 726 is less than the difference stored in step 722, the tap reduction in the tap upgrade command recovery step 724 in step 728 is reduced. Command to return the system to its initial state. Next, the program proceeds to step 740 where a step of a corresponding program is executed.

Similarly, returning to step 727, if the difference in power factor is compared to the previous value and the difference in power factor is determined to be higher than the previous value, the program proceeds to step 729, where the lead voltage regulator controller 610 commands the first voltage regulator 630. Reduce the tap position. It should be noted that since the difference in power factor after the tap increase command in step 725 is not determined in step 727 is less than the difference stored in step 723, the tap improvement in the tap down command recovery step 725 in step 729 is increased. Command to return the system to its original status. Next, the program proceeds to step 740 where a step of a corresponding program is executed.

The procedures of steps 740 and 742 through 749 are similar to steps 720 and 722 through 729, respectively, except that in step 744, the pilot voltage regulator controller 610 commands the first voltage regulator controller 630 to increase the tap position in step 744, The non-slave voltage controller regulator controller 620 commands the second voltage regulator controller 640 to increase the tap position (as in step 724). Thus, steps 740 and 742 through 749 represent one of the opposite methods of reducing the power factor difference compared to steps 720 and 722 through 729.

In an alternate embodiment of method 700, the program may proceed directly to step 740 instead of 720 after the decision in step 710, and if steps 740 and 742 through 749 fail to reduce the difference in power factor, the program only returns to step 720. . In another embodiment, one of the records for successfully reducing the power factor difference of steps 720 and 722 through 729 and one of the successful reductions of the power factor difference for steps 720 and 722 to 729 can be stored. In this case, after step 710, the program may proceed to step 720 or 740 based on a successful success of the power factor difference determined with reference to the stored record.

Referring again to FIG. 1, in certain exemplary embodiments, multiphase control system 100 is capable of monitoring and controlling the voltage between three phases that are adjusted by independently controlling each of tap changers 132, 142, and 152. Difference and phase angle. As discussed above, sense signals 138, 148, and 158 provide feedback from respective voltage regulators 134, 144, and 154 to regulator controllers 130, 140, and 150. In some exemplary embodiments, sense signals 138, 148, and 158 each contain data related to the waveform of the respective phase. The three phase waveforms can be compared to each other to calculate a voltage difference and a phase angle between each of the three phases. Thus, one or more of the three respective tap changers 132, 142, and 152 can be independently controlled to adjust and correct and/or improve the voltage differential and phase angle balance.

FIG. 8 illustrates one method of monitoring and controlling the amount of voltage difference between phases in accordance with an exemplary embodiment of the present invention. FIG. 10A illustrates a vector diagram of three phases 134, 144, and 154 and respective voltage differences 1002, 1004, and 1006 between the three phases. As discussed above, regulator controllers 130, 140, and 150 receive sense signals 138, 148, and 158 that contain data associated with the voltages of the respective phases. Referring to Figures 8 and 10A, in step 802 of the monitoring and control method, the polyphase control system 100 uses this data to calculate an initial voltage difference or difference between each of the phases. For example, the initial voltage difference between the first phase 134 and the second phase 144 can be expressed as a difference of 1 ₀ 1002, and the initial voltage difference between the second phase 144 and the third phase 154 can be expressed as a difference of 2 ₀ 1004, And the initial voltage difference between the third phase 154 and the first phase 134 can be expressed as a difference of 3 ₀ 1006. In step 804, a maximum difference value is determined. In step 806, the phase opposite the maximum delta value or the output voltage of voltage regulators 134, 144, 154 is adjusted. For example, if the maximum difference value is the difference 1 ₀ 1002 indicating the voltage difference between the first phase 134 and the second phase 144, the tap position of the voltage regulator corresponding to the third phase 154 is adjusted to adjust the third. The output voltage of the phase.

Subsequently, in step 808, new voltage differences (ie, deltas) are calculated, and the new deltas can be represented as deltas 1 ₁ , deltas 2 _{1 ,} and deltas 3 _{1 , respectively} . In step 810, the new differences are compared to determine whether the voltage balance between the new differences (difference 1 ₁ , difference 2 _{1 ,} and difference 3 ₁ ) is better than the initial difference (difference 1 ₀ The balance between the difference of 2 ₀ and the difference of 3 ₀ ). If the balance is indeed better, the procedure is repeated from step 802 until the balance between the new differences is not better than the initial difference. When the balance is not better, the program proceeds to step 812 where the previous voltage regulator adjustment is restored to bring the system into one of the three phases to optimize the voltage balancing condition. Therefore, in step 814, the current voltage regulator setpoint is maintained.

In certain exemplary embodiments, multi-phase control system 100 periodically reconfirms that the system is in an optimized voltage delta balance condition. In these example embodiments, the method includes a step 816 in which it is determined whether a pre-determination period has elapsed. If the pre-determination period has elapsed (which means that the re-confirmation of the optimization state), the method is repeated from step 802. If the pre-determination period has not been elapsed, the current voltage regulator setting is maintained as in step 814. The exemplary method illustrated in Figure 8 is only one way to balance the voltage difference in a three-phase system. In an alternate embodiment, the steps depicted in the example method of FIG. 8 may be modified or removed. Some of the sudden. Similarly, a similar approach can be applied to other types of multiphase control systems.

9 illustrates one method of monitoring and controlling phase angles between phases in accordance with an exemplary embodiment of the present invention. FIG. 10B illustrates a vector diagram of three phases 134, 144, and 154 and respective phase angles 1012, 1014, and 1016 between the three phases. Referring to Figures 9 and 10B, in step 902, the polyphase control system uses the measurements 138, 148, and 158 from the regulator controller to calculate a set of initial phase angles associated with the three phases. For example, an initial phase angle between the first phase angle 134 and the second phase angle 144 can be expressed as a phase angle of 1 ₀ 1012, and an initial phase angle between the second phase 144 and the third phase 154 can be expressed as a phase angle of 2 ₀ The initial phase angle between 1014, and the third phase 154 and the first phase 134 can be expressed as a phase angle of 3 ₀ 1016. In step 904, the maximum phase angle is determined. In step 906, the output voltages of the voltage regulators 134, 144, 154 opposite the maximum phase angle are adjusted. For example, if the maximum phase angle is a phase angle 1 ₀ 1012 indicating a phase angle between the first phase 134 and the second phase 144, the tap position of the voltage regulator corresponding to the third phase 154 is adjusted to adjust the third phase. 154 output voltage.

Subsequently, in step 908, new phase angles are calculated, and the new phase angles can be represented as phase angle 1 ₁ , phase angle 2 _{1 ,} and phase angle 3 _{1 , respectively} . In step 910, the new phase angles are compared to determine whether the phase angle balance between the new phase angles (phase angle 1 ₁ , phase angle 2 _{1 ,} and phase angle 3 ₁ ) is better than the initial phase angle (phase angle 1) The balance between ₀ , phase angle 2 ₀ and phase angle 3 ₀ ). If the balance is indeed better, the procedure is repeated from step 902 until the balance between the new phase angles is not better than the initial phase angle. When the balance is not better, the program proceeds to step 912 where the previous voltage regulator adjustment is restored to cause the system to enter one of the three phases to optimize the phase angle balance condition. Therefore, in step 914, the current voltage regulator setting is maintained.

In certain exemplary embodiments, as discussed above, the multi-phase control system 100 periodically re-confirms that the system is in an optimized phase angle balancing condition in step 916. Figure 9 The exemplary method illustrated in the illustration is only one method of balancing the phase angle in a three-phase system. In alternate embodiments, some of the steps depicted in the example method of FIG. 9 may be modified or removed. Similarly, a similar approach can be applied to other types of multiphase control systems.

In some exemplary embodiments, control of voltage regulators 134, 144, and 154 for voltage differential or phase angle balancing is automatically performed by multi-phase control system 100 as an existing control scheme. In certain exemplary embodiments, voltage adjustment is performed manually by an operator when it is determined that one or more of the tap changers 132, 142, and 152 should be adjusted to facilitate a better voltage or phase angle balance. Control of 134, 144 and 154. In certain example embodiments, the operator may set additional voltage settings (which include bandwidth and time delay settings) for each of the three phases to allow for phase angle differences.

Although the embodiments of the present invention have been described in detail herein, the description is for illustration only. The features of the invention described herein are representative, and in alternative embodiments certain features and elements may be added or omitted. In addition, those skilled in the art can modify the aspects of the embodiments described herein without departing from the spirit and scope of the invention as defined in the following claims. The broadest interpretation is to cover the modifications and equivalent structures.

10‧‧‧System

100‧‧‧Multiphase Control System / Multiphase Controller

102‧‧‧Communication link

104‧‧‧Communication link

120‧‧‧ memory

130‧‧‧Voltage regulator controller

132‧‧‧ Tap changer

134‧‧‧Voltage regulator / first phase

136‧‧‧Control signal

138‧‧‧Sensing signal/measurement data

140‧‧‧Voltage regulator controller

142‧‧‧ Tap changer

144‧‧‧Voltage regulator / second phase

146‧‧‧Control signal

148‧‧‧Sensing signal/measurement data

150‧‧‧Voltage Regulator Controller/Network

152‧‧‧ Tap changer

154‧‧‧Voltage regulator / third phase

156‧‧‧Control signal

158‧‧‧Sensing signal/measurement data

160‧‧‧Manage terminal/management computer

Claims (24)

A method for maximum deviation multiphase operation, comprising: setting a low boundary value of a maximum deviation window based on a first highest tap position of a plurality of tap changers; switching based on the plurality of taps One of the first lowest tap positions is set to set a high boundary value of the maximum deviation window; and the plurality of voltage regulator controllers independently adjust the respective complex numbers based on the tap positions of the plurality of tap changers Each of the voltage regulators has a plurality of voltages. The method of claim 1, wherein the first highest tap position comprises a current highest tap position, and wherein the first lowest tap position comprises a current lowest tap position. The method of claim 1, comprising: setting the low boundary value of the maximum deviation window based on the first highest tap position of the plurality of tap changers and a user-defined maximum deviation value; The first lowest tap position of the plurality of tap changers and the user-defined maximum deviation value set the high boundary value of the maximum deviation window. The method of claim 3, comprising: determining a difference between the tap position of the first tap changer and the second tap changer of the plurality of tap changers and the plurality of Whether the difference between the tap position of the second tap changer and the third tap changer of the tap changer is equal to or greater than the user-defined maximum deviation value; The difference is equal to or greater than the user-defined maximum deviation value, and the positions of the two plurality of tap changers are set to the low boundary value, and When the line voltage of the voltage regulator output associated with the plurality of tap changers is higher than a set voltage band, the high boundary value of the maximum deviation window and the low boundary value are decremented And when it is determined that the differences are equal to or greater than the user-defined maximum deviation value, the positions of the plurality of tap changers are set to the high boundary value, and are switched by the plurality of taps When the line voltage of the voltage regulator output associated with the two is lower than the set voltage band, the high boundary value of the maximum deviation window and the low boundary value are incremented. The method of claim 2, further comprising: setting the low boundary value and the high boundary value to be both when the low boundary value and the high boundary value are set to be greater than the high boundary value An average of one of the highest current tap position and the lowest current tap position of the plurality of tap changers. The method of claim 5, further comprising: setting the low boundary value and the high boundary value to the highest current tap position and the lowest current tap position of the plurality of tap changers After the average, the high boundary value of the maximum deviation window is incremented and the low boundary value of the maximum deviation window is decremented until the maximum deviation window is equal to the user-defined maximum deviation value. The method of claim 1, further comprising: transmitting the low boundary value and the high boundary value from a lead voltage regulator controller to the plurality of voltage regulator controllers, wherein the lead voltage regulator controller is selected from the group consisting of The plurality of voltage regulator controllers. The method of claim 1, further comprising: controlling the tap positions of the plurality of tap changers to operate within the low boundary value and the high boundary value. A system for maximum deviation multiphase operation, comprising: a plurality of voltage regulators; a plurality of tap changers, each of the plurality of tap changers configured to change the plurality of voltage regulators One of the tap positions; a plurality of voltage regulator controllers configured to set a tap position of the plurality of tap changers; and a controller coupled to the plurality of voltage adjustments At least one of the controllers configured to: set a low boundary value of one of the maximum deviation windows based on the first highest tap position of the plurality of tap changers; and based on the plurality of points Setting a high threshold value of one of the maximum deviation windows, wherein the plurality of voltage regulator controllers are configured to be based on the plurality of tap changers The respective positions of the plurality of voltage regulators are adjusted by the joint position. A system for maximum deviation multiphase operation of claim 9, wherein the first highest tap position comprises a current highest tap position, and wherein the first lowest tap position comprises a current lowest tap position. The system of claim 9 for maximum deviation multiphase operation, wherein the controller is further configured to: determine the first highest tap position and a user-defined maximum deviation based on the plurality of tap changers Setting a low boundary value of a maximum deviation window; and setting the high boundary of the maximum deviation window based on the first lowest tap position of the plurality of tap changers and the user-defined maximum deviation value value. The system of claim 11 for maximum deviation multiphase operation, wherein the controller is further configured to: Determining a difference between a tap position of the first tap changer and a second tap changer of the plurality of tap changers and the second score of the plurality of tap changers Whether the difference between the joint changer and the third tap changer is equal to or greater than the user-defined maximum deviation value; when it is determined that the differences are equal to or greater than the user-defined maximum deviation value, The position of the plurality of tap changers is set to the low boundary value, and the line voltage of the voltage regulator output associated with the plurality of tap changers is higher than a setting And the voltage band is such that the high boundary value of the maximum deviation window and the low boundary value are decremented; and when the difference is determined to be equal to or greater than the user-defined maximum deviation value, the plurality of taps are switched The position of both of the devices is set to the high boundary value, and the line voltage of the voltage regulator output associated with the plurality of tap changers is lower than the set voltage band, so that the maximum The high boundary value of the deviation window and the low boundary value Who is incremented. The system of claim 9 for maximum deviation multiphase operation, wherein the plurality of voltage regulator controllers control the tap positions of the plurality of tap changers to be at the low boundary value and the high boundary value Internal operation. The system of claim 9 for maximum deviation multiphase operation, wherein the plurality of voltage regulator controllers comprise a first voltage regulator controller, a second voltage regulator controller, and a third voltage regulator control The plurality of tap changers including a first tap changer associated with the first voltage regulator controller and a second tap associated with the second voltage regulator controller a changer and a third tap changer associated with the third voltage regulator controller, and wherein the first regulator controller is configured to transmit the low boundary value and the high boundary value to The second voltage regulator controller and the third voltage regulator control Device. The system of claim 14 for maximum deviation multiphase operation, wherein the second voltage regulator controller and the third voltage regulator controller are configured to respectively respectively apply the second tap changer and the first The tap positions of the three-prong connector are transmitted to the first voltage regulator controller. A system for maximum deviation multiphase operation of claim 9, comprising: a management terminal configured to control and/or monitor the plurality of voltage regulator controllers. A method for optimizing power factor correction, comprising: comparing a difference between a measured power factor between two voltage regulators and a pre-determined maximum difference; and when determining that the difference is greater than the maximum difference, storing the difference To measure a previous difference in one of the power factors; adjust a tap position of one of the voltage regulators by a controller; compare a second difference and amount of the measured power factor between the two voltage regulators Measuring the previous difference of the power factor; and when the second difference of the equivalent power factor is not less than the previous difference of the measured power factor, the controller causes the tap position of the one of the voltage regulators Return to the previous tap position. A method for optimizing power factor correction according to claim 17, comprising: comparing one of an average line voltage value associated with the two voltage regulators with a set voltage adjustment value; and when the average line voltage value is greater than or equal to When the voltage adjustment value is set, the first voltage regulator of one of the two voltage regulators is set to a lower tap position. The method for optimizing power factor correction according to claim 18, comprising: when the average line voltage value is not greater than or equal to the set voltage adjustment value, One of the two voltage regulators, the second voltage regulator, is set to a higher tap position. The method of optimizing power factor correction of claim 17, wherein the pre-determined maximum difference is a user-defined maximum deviation value. A method of phase angle balancing, comprising: calculating an initial first phase angle, an initial second phase angle, and an initial third phase angle, wherein the initial first phase angle, the initial second phase angle, and the initial The three phase angles form an initial phase balance condition; determining which of the initial first phase angle, the initial second phase angle, and the initial third phase angle has the highest value; and adjusting the opposite of the initial phase angle having the maximum value One phase of one phase output voltage. A method for balancing a phase angle of claim 21, comprising: calculating a new first phase angle, a new second phase angle, and a new third phase angle, wherein the new first phase angle, the new second phase angle And the new third phase angle forms a new equilibrium condition; determining whether the new equilibrium condition is better than the initial equilibrium condition; when the new equilibrium condition is better than the initial equilibrium condition: determining the new first phase angle, the new first Which of the two phase angles and the new third phase angle has a maximum value; and adjusting the output voltage of the phase opposite the new phase angle having a maximum value; and when the new equilibrium condition is not superior to the initial equilibrium condition , restore a previous adjustment. A method for balancing a voltage difference, comprising: calculating an initial first voltage difference, an initial second voltage difference, and an initial a third voltage difference amount, wherein the initial first voltage difference amount, the initial second voltage difference amount, and the initial third voltage difference amount form an initial phase balance condition; determining the initial first voltage difference amount, the initial second voltage Which of the difference and the initial third voltage difference has a maximum value; and adjusts one of the output voltages opposite to the initial voltage difference having the maximum value. The method for balancing the voltage difference of claim 23, comprising: calculating a new first voltage difference amount, a new second voltage difference amount, and a new third voltage difference amount, wherein the new first voltage difference amount, the new The new second voltage difference and the new third voltage difference form a new equilibrium condition; determining whether the new balance condition is better than the initial balance condition; when the new balance condition is better than the initial balance condition: determining the new a voltage difference amount, the new second voltage difference amount, and the new third voltage difference amount having a maximum value; and adjusting the output voltage of the phase opposite to the new voltage difference amount having a maximum value; and when When the new balance condition is not better than the initial balance condition, the previous adjustment is restored.